Positron autoradiography for intravascular imaging: feasibility evaluation

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Cardiovascular Research

Background:

• Vulnerable plaques, characterized by inflammation and high lipid content, cause most acute coronary artery disease events.
• Current imaging methods like angiography lack the ability to assess plaque inflammation.
• 18F-FDG PET imaging shows potential for detecting vulnerable plaques, but motion and plaque characteristics limit its intravascular application.

Purpose of the Study:

• To investigate a novel intravascular imaging detector concept for detecting vulnerable coronary plaques.
• To evaluate the feasibility of using a storage phosphor detector for plaque imaging with 18F-FDG.

Main Methods:

• Development of an intravascular catheter with a storage phosphor tip designed to absorb positrons from 18F-FDG.
• Utilizing Monte Carlo simulations and experimental evaluations with plastic tubes simulating arteries and FDG-containing plaques.
• Assessing the detector's sensitivity for various plaque sizes and activities in simulated arterial environments.

Main Results:

• The storage phosphor detector demonstrated sufficient sensitivity to detect coronary plaques as small as 1-2 mm with activities of 590-1180 Bq.
• Experimental studies confirmed the possibility of detecting simulated plaques within a 2 mm diameter tube.
• The proposed detector tip's dimensions are adaptable to match arterial dimensions.

Conclusions:

• The developed storage phosphor detector is a viable tool for intravascular imaging of vulnerable plaques.
• This technique offers potential for fast and accurate detection of coronary and other intravascular plaques.
• Further development could enhance early diagnosis and management of cardiovascular disease.